I’ve only played three 5-player games this far. It was an interesting experience, even though it only reinforced my opinion: Puerto Rico is a four player game. Five players make the game a bit too chaotic in my opinion. In some games the chaos doesn’t matter that much, but Puerto Rico is a game in which I’d like to keep control.
To prove my theory, I lost the game. However, my play was weak — playing like that, I would’ve lost a 4-player game as well.